Process for embedding hard particles in a bearing surface
AssigneeLaystall Engineering Company Limited
InventorJohn E. Tanner
Life of this patent
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Abstract
In a process for forming an extremely hard-wearing rubber or bearing surface on a metal machine part, particles of hard grit, such as carbide grit, are deliberately formed into the surface using a resiliently-loaded tool, so that the surface becomes permanently impregnated with the hard particles. During the operation the particles can conveniently be contained in a slurry that flows over the surface. After impregnation, a lapping operation is performed on the impregnated surface using a fine carbide grit.
Claims13
A process of treating a metal surface of a machine part, especially a rubbing or bearing surface, comprising a first operation of deliberately impregnating the machine part surface with particles of a hard grit, harder than said metal surface, by mechanically forcing the grit into the surface so as to become permanently embedded therein, the operation being carried out at ordinary ambient temperatures using a resiliently-loaded tool to force in the particles and a further operation of lapping the impregnated surface using a fine carbide grit.
A process of treating a cylindrical bore surface of a metal machine part, comprising, in a first operation, mounting the part with the bore axis vertical and operating on the surface with a lapping tool having resilient-loaded lapping blades that are both rotated about and reciprocated along said axis relatively to said bore while a suspension or slurry of hard graded grit particles in a lapping fluid is simultaneously poured in at the top of the bore to flow over said surface, the grain size of the grit particles and the pressure of the tool blades being so chosen as to embed grit particles permanently in said surface;
- followed by, in a further operation, lapping of the grit-loaded surface using a fine grit.
Dependencies are inferred from the claim text.